考虑循环荷载效应的土与结构界面模型评估

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-09-24 DOI:10.1002/nag.3831
Hai-Lin Wang, Zhen-Yu Yin, Xiao-Qiang Gu, Yin-Fu Jin
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引用次数: 0

摘要

在岩土工程中,模拟循环荷载下的土壤-结构界面(SSI)至关重要。为探索 SSI 的循环行为,已经开展了大量研究。然而,现有的模型评估主要依赖于实验和模拟之间的直接比较,对循环荷载下累积法向位移和应力退化等特定行为的分析有限。本研究提出并调整了六个 SSI 模型,包括三个非线性增量模型和三个弹塑性模型。这些模型结合了非线性剪切模量、临界状态理论和颗粒断裂效应,以增强其捕捉 SSI 行为的能力。利用基于优化的校准进行公平比较,根据实验数据对模型参数进行微调。为了评估模型的性能,还进行了包括全局比较和累积法向位移和应力退化等特定行为在内的综合评估。结果表明,所有模型都有效地复制了 SSI 系统的典型行为。通过加入颗粒断裂效应,这些模型可以更好地表示循环加载下的可逆和不可逆法向位移。不可逆法向位移保持稳定,只受土壤性质而非应力水平的影响。此外,模型还成功地捕捉到了由不可逆法向位移引起的法向刚度恒定条件下的应力衰减。
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Evaluation of Soil–Structure Interface Models Considering Cyclic Loading Effect

The simulation of the soil–structure interface (SSI) under cyclic loading is critically important in geotechnical engineering. Numerous studies have been conducted to explore the cyclic behaviors exhibited at the SSI. However, existing model evaluations primarily rely on direct comparisons between experiments and simulations, with limited analysis focused on specific behaviors like accumulated normal displacement and stress degradation under cyclic loading. This study proposes and adapts six SSI models, including three nonlinear incremental models and three elastoplastic models. These models incorporate nonlinear shear modulus, critical state theory, and particle breakage effects to enhance their capability to capture SSI behaviors. Utilizing optimization-based calibration for a fair comparison, the model parameters are fine-tuned based on the experimental data. Comprehensive assessments including global comparisons and specific behaviors like accumulated normal displacement and stress degradation are carried out to evaluate the models' performance. The results indicate that all models effectively replicate the typical behaviors of SSI systems. By incorporating the particle breakage effect, the models can represent both the reversible and irreversible normal displacements under cyclic loading with better performance. The irreversible normal displacement remains stable and is solely influenced by the soil properties rather than the stress level. Moreover, the models successfully capture the stress degradation under constant normal stiffness caused by the irreversible normal displacement.

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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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